ISRO official states TRISHNA satellite developed with France is in advanced stage of realisation
Must read — 1 past UPSC question on this theme (Prelims GS-1 2018); also a Prelims-style fact (scheme, body, law, agreement or report).
2-minute summary
India's Space Research Organisation (ISRO) and France's National Centre for Space Studies (CNES) are in advanced stages of realizing their joint satellite mission, TRISHNA (Thermal Infra-Red Imaging Satellite for High-resolution Natural Resource Assessment). Slated for launch in the next 12 to 16 months aboard India's Polar Satellite Launch Vehicle (PSLV), TRISHNA represents the third major collaborative satellite project between India and France, following Megha-Tropiques (2011) and SARAL (2013). The satellite is designed to deliver high spatial and temporal resolution monitoring of the Earth's surface temperature, evapotranspiration, emissivity, and radiation variables. It will carry two primary payloads: a Thermal Infra-Red (TIR) payload engineered by CNES and a Visible-Near Infra-Red Short Wave Infra-Red (VNIR-SWIR) payload developed by ISRO. Built around a satellite bus from the U.R. Rao Satellite Centre (URSC) in Bengaluru, TRISHNA will operate under an open data policy to support global research on water resource management, climate change, and agricultural monitoring.
Why it's in the news
ISRO officials announced at the 'TRISHNA Water for Tomorrow' workshop in October 2026 that the joint Indo-French TRISHNA satellite has reached an advanced stage of realization. The mission is scheduled for launch within 12-16 months using ISRO's PSLV.
Facts to remember
- TRISHNA stands for Thermal Infra-Red Imaging Satellite for High-resolution Natural Resource Assessment.
- TRISHNA is jointly developed by India's ISRO and France's CNES.
- TRISHNA is the third joint satellite mission between India and France, following Megha-Tropiques and SARAL.
- CNES is supplying the Thermal Infra-Red (TIR) payload, while ISRO is developing the VNIR-SWIR payload.
- The satellite will be launched aboard ISRO's Polar Satellite Launch Vehicle (PSLV).
- The U.R. Rao Satellite Centre (URSC) in Bengaluru is responsible for the satellite bus development.
Background and context
Indo-French space cooperation spans over six decades, originating in the 1960s when France assisted India in setting up the Thumba Equatorial Rocket Launching Station (TERLS). Over the years, this strategic partnership evolved from sound-rocket technology sharing to joint satellite development and space exploration. In 2011, ISRO and CNES launched 'Megha-Tropiques' to study the tropical climate and water cycle, followed in 2013 by 'SARAL' (Satellite with ARGOS and ALTIKA) for oceanographic studies. TRISHNA marks the third dedicated joint Earth observation satellite, expanding collaboration into thermal imaging and land-surface processes. Beyond Earth observation, France is also partnering with India on human spaceflight through ISRO's Gaganyaan programme, providing flight medicine training and space medicine hardware, reflecting deep mutual trust and strategic autonomy in space technology.
International organisations
- CNES (Centre National d'Études Spatiales) — France's national space agency, partnering with ISRO on joint satellite missions including Megha-Tropiques, SARAL, and TRISHNA.
Previous UPSC questions on this theme
- Prelims GS-1 2018 — With reference to India's satellite launch vehicles, consider the following statements : 1. PSLVs launch the satellites useful for Earth resources monitoring whereas GSLVs are designed mainly to launch communication satellites. 2. Satellites launched by PSLV appear to remain permanently fixed in the same position in the sky, as viewed from a particular location on Earth. 3. GSLV Mk III is a four-staged launch vehicle with the first and third stages using solid rocket motors; and the second and fourth stages using liquid rocket engines. Which of the statements given above is/are correct ? (a) 1 only (b) 2 and 3 (c) 1 and 2 (d) 3 only
Mains practice: Discuss the significance of Earth observation satellite missions in enhancing water resource management and climate resilience in India. Highlight the key contributions of Indo-French space collaboration in this context.
Earth observation (EO) satellites have become indispensable tools for environmental governance, resource mapping, and disaster mitigation. The upcoming launch of the Indo-French TRISHNA (Thermal Infra-Red Imaging Satellite for High-resolution Natural Resource Assessment) mission via the Polar Satellite Launch Vehicle (PSLV) underlines the growing reliance on high-resolution space data for climate resilience.
• Agriculture and Water Resource Management:
TRISHNA's high spatial and temporal resolution monitoring of surface evapotranspiration directly addresses agricultural drought monitoring and soil moisture assessment. It enables precision irrigation, helping track crop water stress and supporting India's PM Krishi Sinchayee Yojana.
• Climate Change and Energy Budgeting:
By monitoring Earth surface temperature, emissivity, and radiation variables at regional scales, EO missions supply data required for climate modelling. This facilitates tracking urban heat island effects, glacier retreat in the Himalayas, and land-degradation processes mapped under UN SDG 13 (Climate Action).
• Strategic Synergy in Space Technology:
Indo-French space ties serve as a cornerstone of bilateral strategic autonomy. Building on past successful joint missions—Megha-Tropiques (2011) for tropical weather and SARAL (2013) for ocean altimetry—TRISHNA demonstrates joint payload integration, where CNES supplies the Thermal Infra-Red (TIR) payload and ISRO delivers the VNIR-SWIR payload.
• Disaster Risk Reduction and Open Data Policy:
Real-time monitoring of thermal anomalies assists in detecting forest fires, volcanic heat fluxes, and coastal water thermal plumes. Adopting an open data policy ensures that scientific datasets are seamlessly disseminated for global ecological research.
Way Forward:
• Integrating satellite thermal data into hyper-local agricultural advisory systems for smallholder farmers.
• Expanding spatial data infrastructure down to Panchayati Raj Institutions (PRIs) for decentralized watershed planning.
• Deepening international scientific partnerships to co-develop space assets for global public goods.
Conclusion:
Indo-French cooperation in satellite technology demonstrates how international science partnerships can address environmental challenges, contributing to sustainable development under UN SDG 6 (Clean Water and Sanitation) and bolstering national climate action goals.
Prelims practice questions
Q1. Consider the following statements regarding the TRISHNA satellite mission: 1. It is a joint Earth observation mission developed by ISRO and NASA. 2. It carries a Thermal Infra-Red payload developed by CNES and a VNIR-SWIR payload developed by ISRO. 3. The satellite is designed for launch using the Geosynchronous Satellite Launch Vehicle Mark III (GSLV Mk III). How many of the above statements are correct?
- Only one
- Only two
- All three
- None
Answer: A. Statement 1 is incorrect because TRISHNA is a joint mission between ISRO (India) and CNES (France), not NASA. Statement 2 is correct because the Thermal Infra-Red (TIR) instrument is provided by CNES while the VNIR-SWIR payload is developed by ISRO. Statement 3 is incorrect because TRISHNA is designated to be launched using India's Polar Satellite Launch Vehicle (PSLV), not GSLV Mk III. Thus, only one statement is correct.
Q2. With reference to space cooperation between India and France, consider the following statements: 1. Megha-Tropiques was launched to study the water cycle and energy exchanges in the tropical atmosphere. 2. SARAL is a joint satellite mission primarily focused on oceanographic studies using altimetry. 3. TRISHNA is the first joint satellite mission undertaken between ISRO and CNES. Which of the statements given above are correct?
- 1 and 2 only
- 2 and 3 only
- 1 and 3 only
- 1, 2 and 3
Answer: A. Statement 1 is correct: Megha-Tropiques (launched 2011) studied tropical atmospheric water cycles. Statement 2 is correct: SARAL (launched 2013) carried the ALTIKA altimeter for oceanographic research. Statement 3 is incorrect: TRISHNA is the third joint satellite mission between ISRO and CNES, following Megha-Tropiques and SARAL.
Q3. Which of the following best describes the primary objective of the 'TRISHNA' satellite mission?
- Providing continuous high-bandwidth satellite communication services for remote island territories.
- Mapping deep-space gravitational waves and solar corona activity using x-ray spectrometers.
- Monitoring Earth's surface temperature, water resources, and thermal anomalies at high resolution.
- Establishing a regional satellite navigation system dedicated to coastal maritime surveillance.
Answer: C. TRISHNA (Thermal Infra-Red Imaging Satellite for High-resolution Natural Resource Assessment) is designed to provide high spatial and temporal resolution thermal infrared and optical observation for surface temperature, water resource management, evapotranspiration, and micro-climate monitoring.
Revision flashcards
- What does the acronym TRISHNA stand for in space technology? Thermal Infra-Red Imaging Satellite for High-resolution Natural Resource Assessment.
- Which space agencies are the principal joint partners in the TRISHNA mission? ISRO (Indian Space Research Organisation) and CNES (Centre National d'Études Spatiales, France).
- Which launch vehicle is designated to launch the Indo-French TRISHNA satellite as announced in October 2026? Polar Satellite Launch Vehicle (PSLV).
- Which primary payloads are contributed by CNES and ISRO for TRISHNA as of October 2026? CNES supplies the Thermal Infra-Red (TIR) payload, while ISRO provides the Visible-Near Infra-Red Short Wave Infra-Red (VNIR-SWIR) payload.
- Why is thermal infrared imaging from TRISHNA valuable for agricultural water management? It enables high-resolution measurement of evapotranspiration, surface temperature, and soil moisture stress to optimize irrigation and monitor drought.